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Reissued May 13, `1930 UNITED STATES PATENT OFFICE FREDERICK J. 1uEuere-Ennav AND'BAUL BALZE, or LEONIA, NEW JERSEY, AssrGNoRs T0 M. B. MANUFACTURING- CO., INC., 0F LEONIA, NEW JERSEY, A. CORPOATION 0F NEW JERSEY' Y CLEAN-our nPLUG Rassut OriginaI 1 1'0. 1,702,878, dated February-19, 19.29, Serial No. 192,357, led May 18, 1927. Reissue No. 17,528, v dated December 17, 1929, Serial No. 361,238, led May 7, 1929. This application for reissue led Iarch 3,1930. Serial No. 432,885.

This invention relates to improvements in clean out plugs and has particular reference to detachable plugs used in connection with clean outs on drains The ordinary clean out, used in connec tion with drains, consists ofa body in the nature of a hollow cylinder of a Vsuitable size, into one end or sideof which is fitted, by a screw thread, a brass plug. The body is usually made of iron and is caulked into the hub of the pipe or trap, leaving the brass plug removable for the purpose of cleaning the drain or trap. In many cases lthe brass plug is lost or broken requiring its replacement. Since the threaded Aportions of the vbody and plug vary somewhat as to their diameters Vfrom other bodies and plugs, it becomes very difficult to 'obtain the size of the new plug that will properly lit the body In manycases it becomes necessary to remove :the old body from .the hub and tou replace it with a new body for which the plug is furnished, but this replacement of the new body and plug involves much labor and (expense.

Among the objects therefore of this present improvement is to provide a' plug which will lit into clean-out bodies of various diameters and which consequently will eliminate the necessity for replacingl or renewing the body of the clean out when only a new plug is'required. This object is attained by providinga new plug with an excessive taper whereb it will be sure to it the -threaded holes o bodies of various diameters and. to so form the thread or threaded surface portion of the new plug in a peculiar manner adapting it to mate in a li uid and gas tight manne with the standar thread ormed on the bo y.l

With the foregoing and other objects iiiK .view the invention consists in the arrange'- ment and combinationof parts hereinafter 'described and claimed, and while theinvention-isnot restricted to the exact details of,V construction disclosed or suggested herein,

still for the purpose of illustrating ai racticalv embodiment thereof, reference is ad tol the accompanying drawings in which like reference characters designate the same "partsy in theA several views, and in which-f Figure 1 is a vertical sectional view of our improved clean out plug.

Fig. 2- is aneularged sectional or fragmentary diagram indicating the relation of the clean out plug threads to the hard metal body structure.

nature into which the molten softer metal of the collar will entenduring the process of formation of the collar upon the core.

It will be noted .that the plug is so formed as to have a greater taper than isl usually found in clean out plugs'or the like. Without intending to be unnecessarily limited to any particular dimensions in this regard, we suggest that the amount'of taper shouldlbe in the proportion of about three inches to twelve inches in length of the plug.

During the formation of the collar 12, a thread 14 is cast thereon. This thread is of peculiar formation in that it is of V-sha e generally speaking, sharp on top or on tile outside, but substantially at on the bottom or inside at 15 i 16 indicates a fragment of abody with which' the plugl is adapted to co-operate.

form or standard, the diameters of the o enings in the Vbodies are by no Vmeans unigdrm or standard. I It Will be seen therefore that our new plug having an excessive taper may readily be drivenor turned into the opening i I i of the body lirrespective of a` considerable variation in diameter of the body opening. As shown best in Fig. 2, when the tapered plug s so driven into the body opening, the sharp pointed edges of the threads 17 will bite into the flat bottoms l5 of soft metal of the plug collar for a number of turns and thereby insure a tight and reliable connection between the plug and the body, and, moreover, making a connection which is separable from time totime as may be required for clean out purposes and without disturbing the effective replacement capability of the plug.

We claim:

a member having a uniform taper throughout the length thereof, the thread having a broad root of a different diameter than a thread to engage same, said member having a soft metal body tov permit a new thread to be cut into the said root on engaging said member with a hard metal threadeddevice, the taper of the thread of the soft metal member being greater than that of the other member, the pitch ofthe angles of the sides of the thread being substantially the same for both members. y

2. ,A closure member of the character set forth, including a core of hard metal, a layer of soft metal cast uponsaid core, said layer being threaded and having a substantially7 uniform taper throughout the 'length thereof, said thread having a broad root of a different diameter than that of a thread engageable therewith, said broad root permitting a new thread to be cut into said root on engagement with a hard metal taper-threaded device, the taper of the first mentioned thread y being greater than that of the thread of said device, the taper of the rst mentioned thread permitting the closure member to l be used with hard metal threaded devices of different diameters.

3. In combination, a rust proof clean out plus, rions sizes,

4.1;;` the taper of the thread of the the said fittings, the plug having approxlmately the same number of threads as the fittings, for the purpose set forth. Y

4. `In combination, a plug having a tapered threaded outer surface, "and a member having a tapered threaded opening receiving said plug and making tight engagement therewith only at the engaging threads, the taper of the threaded surface of said plug being different to a large degree from the tapery of the said opening, substantially as and for the purpose set forth.

5. In combination, a plug having a tapered threaded oute) surface and a member having a tapered threaded openin receiving said plu the taper of the threa ed surface of said p ug being substantially different than the taper of said opening, said surface having 65 approximately the same number of threads 1. The herein described tting comprising as said member, whereby said plug may be used with members having threaded openings of substantially varying sizes.

6; In combination, a clean-out (plug having a threaded outer surface, and a rainage fitting having a tapered threaded openingreceiving said plug, the taper of the threaded surface of said plug being greater to a large degree than the taper of said opening, where- 'p by said plug may be used with fittings having threaded openings of various sizes.

7. In combination, a clean-out plug having openings of su stantially varyingsizes, the

combination with one of said drainage mem# bers, of a rustless threaded clean-out plug therefor, the taper of the thread of the plug being substantially greater than thatrof the a tapered threaded outer surface, and a z member, and having approximately the same number'of threads as the latter, as and for the purpose set forth.

tures.

" FREDERICK J. MERSFELDER. PAUL BALZE. f

and threaded drainage fittings of va- V plug being considerably greater than that of In testimony whereof we affix our signa,

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